THE CODLING MOTH TN THE YAKIMA VALLEY. 



31 



Table 27. — Length of life of male and female codling moths of the first brood, 



Yakima, Wash., 1920. 



Male. 



Female. 



Male. 



Female. 



Male. 



Female. 



Length 

 of life. 



Num- 

 ber of 

 moths . 



Length 

 of life. 



Num- 

 ber of 

 moths. 



Length 

 of life. 



Num- 

 ber of 

 moths . 



Length 

 of life. 



Num- 

 ber of 

 moths. 



Length 

 of life. 



Num- 

 ber of 

 moths . 



Length 

 oflife. 



Num- 

 ber of 

 moths. 



Days. 



1 



2 



3 



4 



5 



6 



7 



8 



9 



10 



11 



12 



13 





 5 

 6 

 6 

 20 

 14 

 14 

 26 

 23 

 22 

 20 

 18 

 27 



Days. 



1 



2 



3 



4 



5 



6 



7 



8 



9 



10 



11 



12 



13 



2 

 7 

 16 

 17 

 31 

 22 

 29 

 21 

 28 

 28 

 41 

 28 

 35 



Days. 

 14 

 15 

 16 

 17 

 18 

 19 

 20 

 21 

 22 

 23 

 24 

 25 

 26 



21 



25 



21 



16 



15 



9 



16 



20 



8 



7 



5 



2 



6 



Days. 

 14 

 15 

 16 

 17 

 18 

 19 

 20 

 21 

 22 

 23 

 24 

 25 

 26 



21 



30 



30 



20 



31 



15 



16 



23 



8 



9 



9 



5 



7 



Days. 

 27 

 28 

 29 

 30 

 31 

 32 

 34 

 35 

 38 

 39 

 40 



Total. 



7 

 4 

 3 

 1 

 1 

 2 

 1 

 

 

 

 



391 



Days. 

 27 

 28 

 29 

 30 

 31 

 32 

 34 

 35 

 38 

 39 

 40 



Total. 





 3 

 2 

 3 

 1 

 2 

 2 

 1 

 1 

 1 

 1 



546 



Average length oflife of male moths, 13.87 days; female moths, 13.24 days. 

 Maximum length oflife of male moths, 34 days; female moths, 40 days. 

 Minimum length oflife of male moths, 2 days; female moths, 1 day. 



LIFE CYCLE OF THE FIRST GENERATION. 



Life-cycle, stock-jar feeding method. — Table 28 gives the life cycle 

 of 177 individuals of the first generation, all of which were reared 

 from egg to moth, the larvae being fed by the stock-jar method. The 

 incubation period averaged 8.98 days, the larval feeding period 18.21 

 days, the cocooning period 5.44 days, the pupal period 12.45 days, 

 and the life cycle 45.08 days. To this must be added 2.93 days, 

 which is the average interval between emergence of the first-brood 

 moth and egg deposition, in order to obtain the complete life cycle 

 from deposition of first-brood egg to deposition of second-brood egg. 

 This gives a complete life cycle of 48.01 days. 



Table 28. — Life cycle of the first generation of the codling moth as observed by 

 rearing, stock-jar feeding method, Yakima, Wash., 1920. 



Date of 

 egg 



Num- 

 ber of 

 indi- 



Incu- 

 ba- 



Larval feeding 

 period. 



Cocooning period. 



Pupal period. 



Life cycle. 1 



deposi- 



Aver- 



Maxi- 



Mini- 



Aver- 



Maxi- 



Mini- 



Aver- 



Maxi- 



Mini- 



Aver- 



Maxi- 



Mini- 



tion. 



uals. 





age. 



mum. 



mum. 



age. 



mum. 



mum. 



age. 



mum. 



mum. 



age. 



mum. 



mum. 







Days. 



Days. 



Days. 



Days. 



Days. 



Days. 



Days. 



Days. 



Days. 



Days. 



Days. 



Days. 



Days. 



June 5 



2 



13 



20.00 



20 



20 



6.00 



7 



5 



12.50 



13 



12 



51.50 



52 



51 



6 



1 



13 



17.00 



17 



17 



4.00 



4 



4 



13.00 



13 



13 



47.00 



47 



47 



8 



12 



12 



20.33 



30 



17 



4.75 



6 



4 



12.83 



14 



12 



49.91 



59 



47 



9 



9 



12 



20.00 



24 



17 



5.22 



7 



3 



12.67 



14 



11 



49.89 



55 



47 



12 



6 



10 



20.00 



24 



17 



4.83 



6 



4 



12.50 



13 



12 



47.33 



52 



44 



13 

 13 



6 



10 



18.83 

 17.14 



23 

 20 



16 

 15 



5.17 

 5.14 



6 



7 



4 

 4 



12.83 

 12.00 



14 

 13 



12 

 11 



46.83 

 45.28 



51 

 47 



43 



44 



7 



11 



I 14 



4 



11 



16.00 



17 



15 



5.25 



6 



5 



13.25 



14 



13 



45.50 



46 



45 



15 



11 



11 



18.45 



24 



15 



5.09 



6 



3 



13.18 



14 



12 



47.72 



54 



44 



16 



9 



11 



17.44 



22 



13 



4.89 



6 



4 



12.44 



14 



11 



45.77 



52 



41 



18 



6 



10 



18.00 



20 



16 



5.00 



7 



4 



12.33 



13 



11 



45.33 



49 



42 



i 19 



11 



10 



17.09 



23 



14 



4.73 



6 



4 



12.82 



14 



11 



44.64 



51 



39 



20 



8 



10 



16.75 



20 



14 



5.13 



7 



3 



12.13 



13 



11 



44.01 



48 



40 



21 



9 



10 



16.56 



18 



15 



6.44 



16 



4 



11.89 



13 



11 



44.89 



56 



42 



26 



4 



6 



20.25 



28 



16 



4.75 



7 



3 



12.00 



13 



11 



43.00 



48 



40 



26 



15 



7 



18.87 



29 



10 



6.27 



11 



4 



12.33 



16 



11 



44.47 



54 



32 



28 



12 



6 



16.83 



22 



11 



7.83 



22 



4 



12.83 



20 



11 



43.49 



67 



33 



29 



7 



6 



16.71 



24 



13 



5.29 



7 



4 



11.14 



12 



9 



39.14 



46 



34 



29 



9 



7 



18.44 



31 



12 



5.56 



8 



4 



11.89 



14 



11 



42.89 



56 



37 



30 



5 



7 



17.20 



19 



16 



4.40 



5 



4 



11.40 



12 



11 



40.00 



42 



38 



July 2 



2 



6 



20.50 



22 



19 



4.50 



5 



4 



12.50 



13 



12 



43.50 



44 



43 



3 



3 



6 



21.33 



26 



17 



7.00 



10 



4 



14.00 



17 



12 



48.33 



59 



39 



4 



5 



6 



19.60 



23 



18 



5.60 



8 



4 



11.80 



14 



11 



43.00 



47 



40 



4 



4 



7 



17.25 



21 



14 



6.75 



11 



4 



11.50 



16 



7 



42.50 



55 



35 



6 



1 



6 



17.00 



17 



17 



5.00 



5 



5 



12.00 



12 



12 



40.00 



40 



40 



6 



1 



7 



21.00 



21 



21 



5.00 



5 



5 



15.00 



15 



15 



48.00 



48 



48 



7 



4 



7 



18.75 



24 



17 



4.25 



5 



4 



13.75 



19 



12 



43.75 



55 



40 



8 



2 



7 



17.50 



18 



17 



4.50 



5 



4 



14.00 



14 



14 



43.00 



43 



43 



9 



2 



7 



16.00 



16 



1. 16 



4.00 



4 



4 



11.00 



11 



11 



38.00 



38 



38 



177 



2 8.98 



18.21 



31 



10 



5.44 



22 



3 



12.45 



20 



7 



45.08 



67 







iAdd 



2.93 da 



ys for 



:ompl« 



telifec 



ycle. 







i 



Avera 



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